CIVIL 3D Convert 3D Faces in TIN surface without calculating triangle connections

[JPhil]

This seems to work well at creating a boundary right on the edges of the triangles. Tried to use it with an internal hole, but the PolyCurve node fails when there are more than one set of curves. Tried to use some copy+pasted DesignScript from the forum for sorting multiple PolyCurves, but it didn’t seem to work for me. So, this works on one contiguous cluster of triangles only.

SurfaceBoundaryEdge.dyn (61.5 KB)

The link to the post about grouping multiple curves for PolyCurve in case someone feels ambitious:

Grouping Curves with Design Script

Design script definition that groups a list of shuffled curves into loops… [GroupCurves] On the package manager search for tstngwtrs-GroupCurves However the node doesn’t need to be downloaded, paste the below code in a code block and call grpCrvs(crv) def grpCrvs(crv:var[]..[]) { dis1 = (crv.StartPoint)<1>.DistanceTo(crv<2>)==0 ||(crv.EndPoint)<1>.DistanceTo(crv<2>)==0; ind1 = List.AllIndicesOf(dis1<1>,true); bln1 = true; ind2 = [Imperative] { …